weigh in

Short definition from Wiktionary

Verb

1. 1
   To undergo a weigh-in.
2. 2
   To subject to a weigh-in.
3. 3
   To weigh.
4. 4
   To bring in one's weight, metaphorically speaking, to bear on an issue; frequently construed with on or with.

Noun

1. 1
   The process of determining a competitor's body weight prior to an event, especially to ensure it is within the weight restrictions.