PWS

*plṭ - to split, to separate (CDG 161)

Geez
falaṭa - to separate, to divide, to split; to know; to distinguish (CDG 161)
Tigrinya
fäläṭä - to discriminate, to discern; to know (TED 2644)
The meaning shift ‘to split, divide’ > ‘to know’ is unproblematic, cf. Hbr. bān, hēbīn ‘to understand’