(archaic) The hold of a ship.

Initialism of trap–neuter–return: a program designed to neuter and release feral cats (and, more rarely, dogs).

(slang, derogatory) Synonym of bottle rat

(banking) A debit balance in the customer’s account that occurs in the course of the banking day and is expected to be repaid by a credit to the account prior to the end of the banking day.