Definition of chins:
(n) :
The bottom of a face, (specifically) the typically jutting jawline below the mouth.
(n) :
(boxing, uncountable) The ability to withstand being punched in the chin without being knocked out.
(n) :
(aviation) The lower part of the front of an aircraft, below the nose.
(v) :
(chiefly UK, transitive) To punch or hit (someone), especially on the chin (part of the body).
(n) :
(slang, US) Talk.
(n) :
(slang, British) A lie, a falsehood.