"Tagbong" is a word in HILIGAYNON

tágbong - To cast overboard, sink,
immerse, throw or put into water or soil
below the surface. Ang napatáy sa
sakayán, gintágbong níla sa dágat. The
man that died on board was buried by them
at sea, was cast overboard. Itágbong iníng
mga sáhà sa higád (binít) sang sápà. Put
these banana-shoots into the earth near the
brooklet. Nagatágbong na ang íya
ginháwa. His life is ebbing away. He is
sinking fast.

tágbong - To be heavy, ponderous, etc.
See búg-at.