silent barter

or si·lent trade

[ sahy-luh nt bahr-ter or sahy-luh nt treyd ]
/ ˈsaɪ lənt ˈbɑr tər or ˈsaɪ lənt ˈtreɪd /

noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019