interlock

When things interlock with each other, they fit or work together. When a bicycle is properly built, all of its separate parts interlock.

The parts of a machine have to interlock for it to work well: gears must interlock with each other, for example. You can also interlock fingers with another person, holding hands so that they're laced together. This verb, dating from the 17th century, combines inter-, "between" and lock, "to close or to lock," from an Old English root.

Definitions of interlock
  1. verb
    coordinate in such a way that all parts work together effectively
    synonyms: mesh
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    type of:
    coordinate, organise, organize
    bring order and organization to
  2. verb
    become engaged or intermeshed with one another
    synonyms: lock
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    type of:
    bosom, embrace, hug, squeeze
    squeeze (someone) tightly in your arms, usually with fondness
  3. noun
    the act of interlocking or meshing
    “an interlocking of arms by the police held the crowd in check”
    synonyms: interlocking, mesh, meshing
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    type of:
    catch, grab, snap, snatch
    the act of catching an object with the hands
  4. verb
    hold in a locking position
    synonyms: interlace, lock
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    type of:
    hold, take hold
    have or hold in one's hands or grip
  5. noun
    a device that prevents an automotive engine from starting
    synonyms: ignition interlock
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    type of:
    device
    an instrumentality invented for a particular purpose
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