彼らは寄ってたかって我々の計画をだめにしてしまった。

they (usually male); them

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to approach; to draw near; to come near; to be close to; to gather (in one place); to come together; to meet; to stop by (while on one's way to another place); to drop by; to make a short visit; to grow old; to grow high (number, etc.); to grow (wrinkly); to lean against; to recline on; to push one's opponent while holding their belt; to decide on a price and come to a deal; to be swayed by (a person); to yield to

to gather; to crowd round; to swarm; to flock; to extort from; to sponge off

we

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

plan; project; schedule; scheme; program; programme

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

no good; not serving its purpose; useless; broken; hopeless; wasted; in vain; purposeless; cannot; must not; not allowed

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to do; to cause to become; to make (into); to turn (into); to serve as; to act as; to work as; to wear (clothes, a facial expression, etc.); to judge as being; to view as being; to think of as; to treat as; to use as; to decide on; to choose; to be sensed (of a smell, noise, etc.); to be (in a state, condition, etc.); to be worth; to cost; to pass (of time); to elapse; verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs"); creates a humble verb (after a noun prefixed with "o" or "go"); to be just about to; to be just starting to; to try to; to attempt to