This is the 1405th most frequent Chinese word.
解除
"To remove, terminate, or lift."
Here, "解除" refers to 'cancel' or 'lift' a state of emergency or alert.
解除警报后，大家都松了一口气。
After the alert was canceled, everyone breathed a sigh of relief.
In this usage, "解除" implies 'relieve' or 'alleviate' a condition or discomfort.
这份药剂帮助解除痛苦。
This medication helps to relieve pain.
In this sentence, "解除" is used to mean 'terminate' or 'end' a formal agreement.