add by mixing or blending on or attaching; "work in the butter and the dough will get the right consistency"; "In his speech, the presidential candidate worked in a lot of learned words"
to move in a twisting or contorted motion, (especially when struggling); "The prisoner writhed in discomfort"; "The child tried to wriggle free from his aunt's embrace"
struggle in opposition; "She tugged and wrestled with her conflicts"
pull hard; "The prisoner tugged at the chains"; "This movie tugs at the heart strings"
pull or strain hard at; "Each oar was tugged by several men"
move by pulling hard; "The horse finally tugged the cart out of the mud"
tow (a vessel) with a tug; "The tugboat tugged the freighter into the harbor"
strive and make an effort to reach a goal; "She tugged for years to make a decent living"; "We have to push a little to make the deadline!"; "She is driving away at her doctoral thesis"
occur between other event or between certain points of time; "the war intervened between the birth of her two children"
get involved, so as to alter or hinder an action, or through force or threat of force; "Why did the U.S. not intervene earlier in WW II?"
be placed or located between other things or extend between spaces and events; "This interludes intervenes between the two movements"; "Eight days intervened"