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кишка тонка stresses
gen.	spineless (у него / у неё Andrew Goff); coward (у него / у неё Andrew Goff); gutless (у него / у неё – gutless wonder Andrew Goff); lily-livered (у него / у неё Andrew Goff); not to have the guts (Interex)
Игорь Миг	you are out of my league
brit.	lack the intestinal fortitude (humourous slitely_mad)
idiom.	not to have the stomach to do something (He doesn't have the stomach to lie to her – У него кишка тонка соврать ей. landaeva); be not man enough (pofigistique); not to have the stomach for something (z484z); simply not up to the task (VLZ_58)
inf.	ain't got the guts (to do something SirReal); not have the nerve (Stas-Soleil); lack the nerve (Stas-Soleil); not have the guts (Stas-Soleil); lack the guts (Stas-Soleil); not having the guts (Stas-Soleil); lacking the guts (Stas-Soleil); not have the balls (Stas-Soleil); not having the balls (Stas-Soleil); lack the balls (Stas-Soleil); lacking the balls (Stas-Soleil); not having the nerve (Stas-Soleil); lacking the nerve (Stas-Soleil); not have the stomach (Stas-Soleil); not have the sack (to do something: You just didn't have the sack to face those tears! Amarantine)
rude	have no balls (4uzhoj)
saying.	you haven't got guts. (Верещагин)
"кишка тонка"
gen.	not to have the guts to; not to have the guts to do (sth.)
inf.	little guts
кишка тонка!
anat.	he isn't up to that!
fig.	he isn't up to that!

кишка тонка: 77 phrases in 15 subjects

Agriculture	3
Anatomy	3
Animal husbandry	2
Gastroenterology	3
General	7
Gynecology	1
Informal	9
Latin	1
Makarov	4
Medical	36
Misused	1
Oncology	1
Physiology	3
Saying	2
Surgery	1