～かける

About

～かける can be used to form compound verbs, indicating that an action is "in progress" or was "about to happen".

E.g. この飲のみかけのコーヒーは誰だれの？ "Whose half drunk coffee is this?"

～かける means that an action "nearly happened" or was "about to happen" if the verb it attaches to is instantaneous (e.g. 落おちる; ぶつかる).

E.g. びっくりしてピザを落おとしかけた。 "I got startled and nearly dropped the pizza."

Summary

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  ～かける compound verbs indicate that an action is "in progress" or was "about to happen"

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  ～かける means that an action "nearly happened" or was "about to happen" if the verb it attaches to is instantaneous