παρεφεδρεύω

A. lie near to guard : keep guard, ἐν Σικελίᾳ Plb. 2.24.13, cf. PAmh. 2.36.8 (ii B.C.), OGI 182.2 (Egypt, i B.C.), etc. ; π. τισί keep watch upon them, Plb. 3.100.7.

2. standimmediately behind, Ael. Tact. 13.3.