slip away phrasal verb (see also slip)

1. to leave a place secretly or without anyone noticing:
He slipped away into the crowd.

2. if something such as an opportunity slips away, it is no longer available:
This time, Radford did not let her chance slip away.

[TahlilGaran] Dictionary of Contemporary English ▲

slip away
1.
to leave quickly and quietly.
On the last night of conference, I decided to slip away for a few hours.

2.
to slowly become less strong or able.
She found her health rapidly slipping away.

Every day a little more of his strength slips away.

3.
to be no longer available.
We're trying to keep the tradition alive, but it's starting to slip away.

I let a great opportunity slip away.

4.
to die.
The doctors worked quickly, but the old man was slipping away.

[TahlilGaran] English Idioms Dictionary ▲

slip away
• slip away/off/out
to go away or escape quietly or in secret
I slipped away after my class and got something to eat.

[TahlilGaran] English Idioms Dictionary ▲

slip away
v. phr. To leave unnoticed.
The party was such a bore that we decided to quietly slip away.

[TahlilGaran] English Idioms Dictionary ▲