Cut or shaped something (usually with scissors or a knife) to make it neat; or having a trim, neat appearance.
From Old English 'trymman' (to make strong or prepare), the meaning shifted to 'make neat or orderly' by the 1500s. Related to 'trim' meaning 'in good order' or 'ready for action.'
Nautical language gave us this meaning—'trim' originally meant adjusting the sails and cargo on a ship to balance it perfectly. When something is 'shipshape and in trim,' it inspired the modern sense of being neat and well-arranged.
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