1. to press (down) on to, to hold (tight to (with acc.), to cover up or close MN.i.539 (piṭṭhi-pāṇiṃ hanukena); Ja.i.483 (hatthena akkhīni); Ja.ii.245 (hatthikumbhe mukhaṃ); Ja.v.293 (aggalaṃ); Thag-a.188.
2. to stampede Vv-a.83 (paṭhaviṃ).

ud + pīḍ for ava + pīḍ, cp. uplāpeti = opilāpeti, & opīḷeti