try to; attempt to; be about to~
Expresses an attempt or intention to do something, or being on the verge of doing it.
This pattern is used when someone makes an effort to do something, or when something is just about to happen. It often carries a nuance of intent or effort, but sometimes the attempt may not succeed. For example, 'ドアを開けようとした' means 'I tried to open the door' (but maybe it didn't open). It can also describe an action that is about to occur naturally, like a baby about to cry or a glass about to fall. In such cases, it conveys a sense of 'almost' or 'on the verge of'.