Definitions from Wiktionary (line up)

▸ verb:  (engineering) To align; to put in alignment; to put in correct adjustment for smooth running.
▸ verb:  (transitive) To put things in a line.
▸ verb:  (intransitive) To get into a line; especially, so as to wait one's turn.
▸ verb:  (intransitive, sports) To start a game in a certain position on the playing field.
▸ verb:  To make arrangements for an event.
▸ verb:  To support a group or movement.
▸ verb:  To agree or correspond.
▸ verb:  (trains) To have switches set so the train is capable of moving along its correct route.
▸ noun:  A haircut where the front region of a person's hair is shaved to form a crisp line between their hair and the shaved region, sometimes coordinated to create a smooth transition between their hair and beard.
▸ noun:  Nonstandard spelling of lineup. [(US, law and law enforcement) a physical or photographic queue of people allegedly involved in a crime, allowing a witness to identify them]
▸ Also see line_up

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