(idiomatic) futilely, in vain, to no avail

(idiomatic) on account of, because of, due to [+genitive]

(idiomatic) piggyback (on somebody's back or shoulders)

(idiomatic) at the helm of, in charge of [+genitive] / (idiomatic) at the front of, before, afore [+genitive]

(idiomatic) first, firstly (before anything else) / (idiomatic) at once, right away, immediately (without waiting)

(idiomatic) at the beginning of, early on in [+genitive]

(idiomatic) on the basis of, based on [+genitive]

(idiomatic) based on, on the basis of, on the grounds of [+genitive]

Used other than figuratively or idiomatically: see na, droga. / in the way of, obstructing [+genitive]; in the way of, obstructing / through, by way of [+genitive]; through, by way of

(idiomatic) ahead, in front, in the lead