Английский словарь американских идиом - weigh in

{v.} 1a. To take the weight of; weigh. * /The man at the airport counter weighed in our bags and took our plane tickets./ * /A doctor weighed in the wrestlers./ 1b. To have yourself or something that you own weighed. - Often used with "at". * /I weighed in at 100 pounds on the scale today./ * /We took our bags to the airport counter to weigh in./ 1c. To have yourself weighed as a boxer or wrestler by a doctor before a match. - Often used with "at". * /The champion didn't want to weigh in at more than 160 pounds./ 2. {slang} To join or interfere in a fight, argument, or discussion. * /We told Jack that if we wanted him to weigh in with his opinion we would ask him./ Compare: TAKE PART.