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serve (one's) purpose
To fit or satisfy someone's requirements; to be useful for or fit to achieve someone's aim, goal, or purpose. Well, it isn't a very pretty car, but it should serve our purpose just fine. Child: "But mom, I want a smartphone!" Mother: "Nonsense, the cell phone you already have serves your purpose just fine."
serve the purpose
To fit or satisfy the necessary requirements; to be useful for or fit to achieve some aim, goal, or purpose. Well, it isn't a very pretty car, but it should serve the purposes of our mission. Child: "But mom, I want a smartphone!" Mother: "Nonsense, the cell phone you have serves the purpose just fine."
serve (one) the same sauce
To treat one the same way that one has treated you—usually poorly. Of course she's not invited to the dinner party! She didn't invite me to her last soiree, so I'm serving her the same sauce.
serve two masters
To simultaneously tend to or support or devote oneself to two different—often conflicting—responsibilities, pursuits, ideas, or people. It comes from the Biblical phrase, "No man can serve two masters." You need to decide if you are married to your wife or to your work because you simply cannot serve two masters.
serve a purpose
To fit or satisfy the necessary requirements; to be useful for or fit to achieve some aim, goal, or purpose. Well, it isn't very flashy, but this old truck ought to serve a purpose somewhere on the ranch. I hope that my lessons served a purpose in my students' lives. You tripped while making fun of those kids? Serves you right!
serve (one) right
To be or deliver the appropriate or deserved consequence(s) for one's improper actions. It serves John right that Dave threw him out of his party last night. He was acting like such a jerk! My girlfriend broke up with me after she found out I had been cheating on her. Serves me right, I suppose. Don't you find it rather unseemly for a man of his age and station to set his cap for a girl who's barely of voting age?
Serve a (useful) purpose
to be useful in accomplishing some purpose. This large book should serve a useful purpose. We can use it for a doorstop.
serve a purpose
Also, serve one's or the purpose . Be useful, meet the needs or requirements, satisfy, as in I don't know why they've added all this information but it probably serves a purpose, or It often serves his purpose to be vague, or We don't have a spading fork but this shovel should serve the purpose. This idiom was first recorded in 1513.
serve two mastersFORMAL
If a person or organization tries to serve two masters, they try to be loyal to two opposing principles, beliefs or organizations. An organization such as the BBC can either make a profit or provide an excellent public service. It cannot, however, be asked to serve two masters. Note: This expression is used in the Bible. In the Sermon on the Mount, Jesus says: `No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other.' (Matthew 6:24, Luke 16:13)