Accuse, acknowledge, acquaint,

Accuse (verb)

To accuse is to charge or lodge a complaint against someone.

• She accused me of poisoning her dog.
• The public prosecutor accused the defendant of murder.
• You can’t accuse me of dishonesty.

Accusation (noun)

• His accusation that I took the money is baseless.

Accustomed (adjective)

If something is an accustomed practice, it is common, normal, regular, habitual or customary.

• Painting barns red is an accustomed practice.

If you are accustomed to something, you are used to it.

• Eskimos are accustomed to cold weather.
• I am not accustomed to living alone.
• He is accustomed to working at night.

Note that after accustomed to we need a noun or an –ing form.

Achieve (verb)

To achieve is to accomplish, reach, or fulfill.

• We have achieved our goal of collecting ten million dollars.
• If you don’t have access to electricity, there is a limit to what you can achieve.

Achieve can also mean attain, gain or acquire.

• Can mere mortal beings achieve perfect happiness?

Achievement (noun)

An achievement is an accomplishment, attainment or fulfillment.

• Moon landing was a stunning technological achievement.
• Singing is just one of her accomplishments.

Acknowledge (verb)

To acknowledge is to accept, recognize, admit or allow.

• They acknowledged their defeat.
• Our constitution acknowledges that everyone is equal before the law.
• He acknowledged her contribution to their business.

Acknowledgement (noun)

Acknowledgement means recognition, credit or recognizance.

• He gave his colleagues full acknowledgment for their help in launching the business.
• His acknowledgment that he took the money cleared his brother of blame.

Acquaint (verb)

To acquaint with someone is to meet them.

• Have you just met her or were you acquainted before?
• My grandfather believes in getting acquainted with everyone in the neighborhood.

To acquaint someone with something is to familiarize them with it.

• It took me several months to acquaint myself with the new job.

Acquaintance (noun)

An acquaintance is a distant friend or someone slightly known to you.

• She is just an acquaintance. I have met only a couple of times.