- (intransitive with an indication of weight) To undergo a weigh-in.
- Two days before the fight, the boxers weigh in with reporters watching.
- His trailer weighed in lighter than it should have. He might have a leak.
- To subject to a weigh-in.
- The had to weigh him in at the loading dock.
- They weighed every third truck in to check for overweight violations.
- (intransitive, with "at") To weigh.
- He weighs in at upwards of 250 pounds.
- (intransitive, idiomatic) To bring in one's weight, metaphorically speaking, to bear on an issue; frequently construed with on or with.
- Everyone wanted to weigh in on what kind of car he should buy.
- Everyone spoke freely, until the boss weighed in.