to do what other people are doing or agree with their opinions.

In large organizations, there's always a tendency to go with the flow.

I never know what to expect when I'm with them, so I've learned that the best thing to do is just go with the flow.

Usage notes: the opposite meaning is expressed by go against the flow:

Not basing my life on making money has meant having to go against the flow of our culture.

• thinking woman's crumpet
• think long and hard
• think nothing of
• think nothing of doing something
• think nothing of something
• think on feet
• think on your feet
• think out loud
• think outside the box
• think over
• think positive
• think something over
• think something through
• think straight
• think-tank
• think the sun shines out arse
• think the sun shines out backside
• think the sun shines out of arse
• think the sun shines out of backside
• think the sun shines out of someone's arse
• think the sun shines out of someone's backside
• think the sun shines out someone's arse
• think the sun shines out someone's backside
• think the world of
• think the world of someone