serve as intermediary / agency / act as intermediary for / serving as go-between / mediate between / act as go-between / act as a go-between / matchmaking / act as intermediary / acting as intermediary / serve as go-between / intermediation / mediate / mediation / middleman / acting as a go-between / serving as intermediary / acting as go-between / be the middleman

becoming slack / become loose / come loose / relaxation / be loosened / becoming loose / sag / slacken / loosen / grow slack / become slack / relax

grow slack / become slack

grow slack / become slack

(of market prices) fall into a slump / (of market prices) falling into a slack / (of market prices) slump / (of market prices) slackening off

slacken off / fall into a slack

slacken off / fall into a slack

give [a wall] a second coat

give [a wall] a second coat