¿Cómo dices esto en Inglés (UK)? assissiate meaning

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Do you mean assassinate?
If so it means to murder someone of political or religious power, usually someone of importance and is usually planned ahead of time but not always.

The president was assassinated.

The assassin planned to assassinate the president.

Or did you mean assistance
Meaning the action of helping someone

I offered my assistance to my co-worker as she needed help.

Or did you mean associate
Which could be either be to connect someone or something to something else

I associated money with happiness

Or a partner or companion in business or at work
My associates and I are going out for drinks after work.