make difficult

burden overburden

block charge clog cramp discommode embarrass hamper hinder hog-tie impede incommode inconvenience lade load obstruct oppress overload retard saddle tax trammel weight

hang up hold up saddle with slow down weigh down

advance aid allow assist benefit boost clear encourage exonerate facilitate forward free further gladden help let go make happy open permit please promote push release support unblock unburden

strengthen

acclimate acclimatize anneal brutalize develop inure season temper

climatize

soften

flex tenderize