Keep is a strong word about holding onto something, whether it's a physical object, a promise, or a way of living. When you keep your baseball cards, you hold onto them rather than giving them away. When you keep a secret, you protect it by not telling others. When you keep a promise, you follow through on what you said you'd do.

The word often suggests continuity and persistence. To keep trying means you don't give up. To keep going means you continue forward despite difficulty. When a refrigerator keeps food cold, it maintains that cold temperature over time. When you keep your room clean, you maintain it in that condition.

The word also appears in many useful phrases. A keepsake is an object you hold onto because it reminds you of someone or something meaningful. When you play for keeps, you're playing seriously, with real stakes. If you do something for keeps, you mean it to be permanent, not temporary.

In medieval castles, the keep was the strongest tower, the final refuge if attackers breached the outer walls. This fortress meaning captures something essential about the word: keep can involve strength, protection, and lasting commitment.