When you insert something or someone, you put it into something else. You could insert yourself into a conversation, or you could insert a comma into the sentence you just wrote.

The verb insert comes from the Latin in-, meaning “into,” and serere, meaning "to join." When you insert yourself into a conversation, you’re joining in, whether your friends want you to or not. Insert can also mean to fit snugly into, or to tuck. You might fit a card into an envelope that fits it perfectly, or insert first one leg and then another into a pair of tights.

Definitions of insert
  1. verb
    Insert your ticket here”
    synonyms: enclose, inclose, introduce, put in, stick in
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    insert as a plug
    insert a plug into
    introduce a microorganism into
    set or place in
    put in a glass container
    catheterise, catheterize
    insert a catheter into (a body part)
    put into a cup
    interlard, intersperse
    introduce one's writing or speech with certain expressions
    feed, feed in
    introduce continuously
    insert inconspicuously or quickly or quietly
    insert surreptitiously or without warrant
    inject, shoot
    force or drive (a fluid or gas) into by piercing
    inoculate with microorganisms
    intersperse alternately, as of protective covers for book illustrations
    type of:
    lay, place, pose, position, put, set
    put into a certain place or abstract location
  2. verb
    put or introduce into something
    insert a picture into the text”
    synonyms: enter, infix, introduce
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    connect, plug in, plug into
    plug into an outlet
    cannulate, cannulise, cannulize, canulate, intubate
    introduce a cannula or tube into
    enter (data or a program) into a computer
    instil, instill
    enter drop by drop
    embed, engraft, imbed, implant, plant
    fix or set securely or deeply
    insert or squeeze tightly between two people or objects
    graft, transplant
    place the organ of a donor into the body of a recipient
    plant in a pot
    fit together or fit inside
    bury, sink
    embed deeply
    type of:
    cause to be attached
  3. verb
    fit snugly into
    insert your ticket into the slot”
    synonyms: tuck
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    type of:
    close in, enclose, inclose, shut in
    surround completely
  4. verb
    insert casually
    synonyms: slip in, sneak in, stick in
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    interpolate or insert (words) into a sentence or story
    type of:
    add, append, supply
    state or say further
  5. noun
    an artifact that is inserted or is to be inserted
    synonyms: inset
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    dickey, dickie, dicky, shirtfront
    a man's detachable insert (usually starched) to simulate the front of a shirt
    type of:
    artefact, artifact
    a man-made object taken as a whole
  6. noun
    a folded section placed between the leaves of another publication
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    type of:
    section, subdivision
    a self-contained part of a larger composition (written or musical)
  7. noun
    (broadcasting) a local announcement inserted into a network program
    synonyms: cut-in
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    type of:
    break, disruption, gap, interruption
    an act of delaying or interrupting the continuity
  8. noun
    (film) a still picture that is introduced and that interrupts the action of a film
    synonyms: cut-in
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    type of:
    break, disruption, gap, interruption
    an act of delaying or interrupting the continuity
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