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gen.	cry on smb.' shoulder (... When you need a shoulder to cry on. When you get so sick of trying, Just hold on tight to your dream. (ELO)); cry in one's beer (Anglophile); cry on someone' shoulder
humor.	cry in one's caviar (Beforeyouaccuseme)
idiom.	find a shoulder to cry on (grafleonov)
slang	pity party (oxforddictionaries.com Deska); gripe (VLZ_58)
vulg.	piss in someone's pocket
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gen.	vent (Ivan Pisarev); complain (Ivan Pisarev); pour one's heart out (Ivan Pisarev); seek sympathy (Ivan Pisarev); seek comfort (Ivan Pisarev); share troubles (Ivan Pisarev); confide (Ivan Pisarev); lament (Ivan Pisarev); grumble (Ivan Pisarev); seek support (Ivan Pisarev); open up (Ivan Pisarev); ask for advice (Ivan Pisarev); talk about problems (Ivan Pisarev); express sorrow (Ivan Pisarev); look for understanding (Ivan Pisarev); share pain (Ivan Pisarev); tell woes (Ivan Pisarev); seek consolation (Ivan Pisarev); share worries (Ivan Pisarev); ask for help (Ivan Pisarev); talk about hardships (Ivan Pisarev); bemoan (Ivan Pisarev); whine (Ivan Pisarev); express grief (Ivan Pisarev); tell about difficulties (Ivan Pisarev); share burdens (Ivan Pisarev); ask for compassion (Ivan Pisarev); unload (Ivan Pisarev); seek reassurance (Ivan Pisarev)
Gruzovik, inf.	cry on someone's shoulder
inf.	cry on someone's shoulder; complain of fate
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Makarov.	cry on shoulder
proverb	cry on somebody's shoulder
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proverb	cry on somebody's shoulder

плакаться в жилетку : 2 phrases in 2 subjects

Proverb	1
Slang	1