godan verb (-ku)
General verb for spitting; can be used literally or figuratively.
道に唾くのはやめてください。
Please don't spit on the road.
彼は怒って地面に唾いた。
He spat on the ground in anger.
Standard kanji spelling for 'to spit'.
Rare variant with 吐く added; may be considered redundant.
吐く is a broader verb for 'to vomit', 'to spit out', or 'to emit'; 唾く specifically means 'to spit saliva'.
Compound of 唾 (tsuba, 'saliva') and く (ku, verbal suffix). The reading つはく is a historical variant.