DEFLATE
WordNet
verb
(1) Become deflated or flaccid, as by losing air
"The balloons deflated"
(2) Reduce or lessen the size or importance of
"The bad review of his work deflated his self-confidence"
(3) Release contained air or gas from
"Deflate the air mattress"
(4) Collapse by releasing contained air or gas
"Deflate a balloon"