Pack

动词
to come or bring together in large numbers or to fill a space:
Thousands of fans are packing into the stadium.
Fans packed the stadium to watch the final game.
The people on the bus were packed (together) like sardines (= there were many of them very close together) .

Packed

形容词
异常拥挤的；紧密地压在一起
一般只用于封闭空间
completely full:
The train was so packed that I couldn't find a seat.
This book is packed with useful information.
The subway is packed with people.

packed/squashed like sardines
If people are packed or squashed like sardines, they
are positioned very close together so that they cannot move:
We were squashed like sardines in the rush-hour train.

packed out

very full of people:
The bar was packed out last night.

Cram

to force a lot of things into a small space:
Eight children were crammed into the back of the car.
The room was packed and we were crammed against the door.

crammed

very full of people or things:
a crammed train/room
The docks were crammed with/crammed full of people trying to board the boats.
On the trip back the train was rammed and I couldn't find a seat.
It's a beautiful city but it's rammed with tourists.

Cramped

not having enough space or time:
a cramped room/house
We have six desks in this room, so we're a little cramped (for space).
I have a very cramped schedule.

Crowded

If a place is crowded, it is full of people:
Crowd 既可以做名词也可以做动词
可以用于开发的空间
By ten o'clock the bar was crowded.
As Christmas gets closer, the shops get more and more crowded.
As Christmas draws nearer, the shops start to get unbearably crowded.
Chen gave her a nod of recognition across the crowded room.
A few kilometres from the crowded beaches of Spain's Mediterranean coast, many once-thriving villages stand deserted and in ruins.
Don't go there in the peak season - it'll be hot and crowded.
Containing too many of something; teeming.

Swamped & flooded

现场被人群淹没，
This place is swamped with people. 这个地方被人群淹没了。
Flood
A flood of people 一波人流
People flooded into costo. 人们涌进了开市客。

Full house

满座，客满
The show had a full house for every performance.
这个演出场场都是爆满的。

Jam

to be, or make something, unable to move:
The door jammed behind me and I couldn't get out.
He jammed the window open with a piece of wood.

Jammed

unable to move:
This drawer is jammed.

jam-packed

挤满的，挤得毫无空隙的
full of people or things that are pushed closely together:
The streets were jam-packed with tourists.

A sea of people
a sea of heads
a large crowd of
Many/too many people
A lot/ lots of people
A ton/ ton of people
A boatload of people