掛け算: (arithmetic) multiplication

calling out to someone

to be concerned about, to worry about / to weigh on one's mind

(more emphatic) Alternative form of かける (kakeru, “to pour onto, to shake onto, to splash, to drip”): to pour/shake/splash vigorously

to lock (a door, etc.) / (Internet slang) (of a SNS account) to change privacy setting to limited people and posts and/or profiles can be seen by limited people.

架け橋, 掛け橋, 懸け橋, 桟: a go-between; (literally) a suspension bridge

前掛け: apron

(idiomatic) to curb, to halt, to put an end to

掛け時計: wall clock, a clock mounted on a wall, pillar, or pole

入掛: suspension (said of performances, matches, etc.)