To insist on something is to demand or swear to it. You can insist that you didn't eat the last piece of cake, and then insist that your brother show your mom the bits of frosting on his fingers.

The verb insist comes from the Latin insistere, meaning “persist,” “dwell upon,” or “stand on.” To insist on something, like a room with a view, is to say that you must have it. To insist that you never met that man before in your life — even though there's a picture of the two of you together — is to claim that you're telling the truth. To insist on tapping your foot on the chair leg is annoying.

Definitions of insist

v be emphatic or resolute and refuse to budge

“I must insist!”
take a firm stand
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hold firm, stand fast, stand firm, stand pat
refuse to abandon one's opinion or belief
assert, asseverate, maintain
state categorically
hunker down
hold stubbornly to a position
allege, aver, say
report or maintain
predicate, proclaim
affirm or declare as an attribute or quality of

v assert to be true

Type of:
posit, postulate
take as a given; assume as a postulate or axiom

v beg persistently and urgently

harass, as with questions or requests
Type of:
beg, implore, pray
call upon in supplication; entreat

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