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делать твёрдым stresses
gen.	solidify; braze; harden; indurate; steady; brawn; concrete; consolidate; asperate; brasen; settle; toughen
dial.	sadden
Makarov.	solidate; undurate; bind (bound)
obs.	brase; brasier
textile	set
делаться твёрдым
gen.	harden; indurate; solidify; steady; brawn; toughen
Makarov.	undurate

делать твёрдым: 6 phrases in 4 subjects

Anatomy	1
General	1
Makarov	3
Obsolete / dated	1