παρείκειν

From LSJ

ὡς μήτε τὰ γενόμενα ἐξ ἀνθρώπων τῷ χρόνῳ ἐξίτηλα γένηται → in order that so the memory of the past may not be blotted out from among men by time

Source

Lexicon Thucydideum

aditum praebere, to provide access, 3.1.1,
qua locus daretur., where opportunity was given. 4.36.2, [vulgo commonly παρῆκον]