Amharic

ṭäbbäḳä - to be firm, secure, tight; to be adhesive, pasted or soldered on; to join someone, to follow after him (AED 2145)

PWS

*ṭbḳ - to adhere, to stick to each other (EDA II)

Thought to be related, as a variant root, to PWS *dbḳ with a similar scope of meanings.