新しん入にゅう幕まく

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Meanings

1

noun

wrestler newly promoted to makuuchi division

sumo

Sumo term for a wrestler who has just been promoted to the top makuuchi division for the first time.

new

入enter, insert

幕curtain, bunting, act of play

幕まく内うち
幕内 is the top division itself; 新入幕 refers specifically to a wrestler who has just entered that division.
十じゅう両りょう
十両 is the second-highest division; a wrestler promoted from 十両 to 幕内 becomes 新入幕.

Compound of 新 (new) + 入幕 (entering the makuuchi division). 入幕 itself is from 入る (enter) + 幕内 (makuuchi).