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a large number of people gathered together in a disorganized or unruly way:

〖集合的に; ｟主に英｠ では単複両扱い〗群衆, 人ごみ; 観衆, 聴衆

e.g. a huge crowd gathered in the street outside.

an audience:

e.g. a crowd of 500 filled the synagogue.

informal, often derogatory a group of people who are linked by a common interest or activity:

｟くだけて･しばしば非難して｠ 〖単数形で〗(同じ仕事･趣味などの)仲間, グループ, 連中

e.g. I've broken away from that whole junkie crowd.

(the crowd) the mass or multitude of people, especially those considered to be drearily ordinary or anonymous:

｟時に非難して｠ ; 〖the ～〗 大衆, 民衆, 庶民

e.g. you have to set yourself apart from the crowd

e.g. free-thinkers who don't follow the crowd

e.g. he'd become just another face in the crowd.

a large number of things regarded collectively:

〖a ～/～s of A〗 多数のA〈人･物〉 (!Aは複数名詞; 単複両扱い)

e.g. the crowd of tall buildings.

1. (of a number of people) fill (a space) almost completely, leaving little or no room for movement:

〈人･集団が〉〈場所など〉に群がる, 押し寄せる

e.g. the dance floor was crowded with revelers.

no object (crowd into) (of a number of people) move into (a space, especially one that seems too small):

«…に/…を通って» 殺到する, 押し寄せる(in) «into, onto/through»

e.g. they crowded into the cockpit.

no object (crowd around) (of a group of people) form a tightly packed mass around (someone or something):

〈人などが〉 【場所･人などに】群がる(around) «around»

e.g. photographers crowded around him.

2. move too close to (someone):

｟くだけて｠ 〈人が〉(不快なほど)〈人〉に接近する; ｟主に米｠ 〈人が〉〈人〉にせっつく, うるさくせがむ, 干渉する

e.g. don't crowd her, she needs air.

Baseball (of a batter) stand very close to (the plate) when batting.

no object (crowd in on) overwhelm and preoccupy (someone):

«…に/…を通って» 殺到する, 押し寄せる(in) «into, onto/through»

e.g. as demands crowd in on you it becomes difficult to keep things in perspective.

3. (crowd someone/something out) exclude someone or something by taking their place:

crowd out: ｟英｠ «…から» A〈人･物〉を締め出す, 押し出す «of» ; A〈ほかのもの〉を寄せ付けない

e.g. grass invading the canyon has crowded out native plants.

be clearly better than or noticeably different from ordinary people or things: to be successful we need to stand out from the crowd.

Old English crūdan‘press, hasten’, of Germanic origin; related to Dutch kruien ‘push in a wheelbarrow’. In Middle English the senses ‘move by pushing’ and ‘push one's way’ arose, leading to the sense ‘congregate’, and hence (mid 16th century) to the noun.