Where does “abklappern” come from?

abklappern (German) comes from German ab-, from German AB, from Middle High German ab, from Old High German ab, from Proto-Germanic *ab, from Proto-Indo-European apó.

abklappern (German): to go down the list, to canvass, to trawl

Definitions

to go down the list, to canvass, to trawl

Ancestry of “abklappern”, step by step

Step	Language	Word	Meaning
1	German	ab-	Separable verb prefix that indicates removal or...
2	German	AB	Abbreviation of Anrufbeantworter; Abbreviation of...
3	Middle High German	ab	—
4	Old High German	ab	of
5	Proto-Germanic	*ab	—
6	Proto-Indo-European	apó	—

Every word from Proto-Indo-European apó →Every word from Proto-Germanic *ab →Every word from German ab- →