Verbs

(v)support, back upgive moral or psychological support, aid, or courage to“She supported him during the illness”, “Her children always backed her up”
(v)back up, back off, back downmove backwards from a certain position“The bully had to back down”
(v)back, back upestablish as valid or genuine“Can you back up your claims?”
(v)back upmake a copy of (a computer file) especially for storage in another place as a security copy“You'd better back up these files!”
(v)clog, choke off, clog up, back up, congest, choke, foul, crap upbecome or cause to become obstructed“The leaves clog our drains in the Fall”, “The water pipe is backed up”