목 꺾일라 translates literally to "you might break your neck." It's a colloquial Korean phrase used as a taunt or strong warning.
In the song, BLACKPINK uses it mockingly in the line "고개들이 돌아 진정해 목 꺾일라" (Heads are turning, calm down, you might break your neck). It's not about actual violence but a badass, swaggering way of saying "we're so stunning that everyone stares, so don't hurt yourself." This snappy, attitude-filled phrase is rare to find in everyday vocabulary and perfectly captures the group's uniquely confident energy, making it an unforgettable and educational expression.
South Korean powerhouse group BLACKPINK isn't knocking on the door in "Shut Down"; they are kicking it wide open and locking everyone else out. Right away, they brush off the idea of a comeback with "컴백이 아냐 떠난 적 없으니까" (It's not a comeback because we never left). They treat the pop music world like a game they already conquered ("게임이 아냐 진 적이 없으니까" / It's not a game because we've never lost). The swagger is blunt and huge. When they tell competitors "간판 내리고 문 잠가" (Pull down the signboards and lock the doors), they mean the party is officially over for everyone else the second their Lamborghini pulls up.
Language-wise, the track gives you a ton of fun, punchy English slang mixed with Korean flexes. Jennie and Lisa trade bars about luxury, boasting about VVS's (top-tier clarity diamonds) and custom dresses they don't buy because designers send them upon request. Lisa drops the delightfully cocky line, "Bunch of wannabes that wanna be me / Me three if I was you." In English, agreeing with someone usually stops at "me too," so throwing out "me three" doubles down on how totally understandable she thinks it is to envy her. From telling haters to sit down humbly while they rain cash to brushing past the paparazzi with a smirk, this track is all about total dominance.