引(ひ)っ込(こ)むto draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it

減量(げんりょう)したので、お腹(なか)が引(ひ)っ込(こ)みました。

Since I lost weight, my stomach has drawn back in. {to draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it}

反抗(はんこう)期(き)の息子(むすこ)は、いつも自分(じぶん)の部屋(へや)に引(ひ)っ込(こ)んでいる。

My rebellious son is always holed up in his room. {to draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it}

僕(ぼく)は、リタイヤ後(ご)は都会(とかい)から出(で)て田舎(いなか)に引(ひ)っ込(こ)むつもりだ。

I plan to withdraw from the city to the countryside after I retire. {to draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it}

休職(きゅうしょく)したので、残業(ざんぎょう)による寝不足(ねぶそく)で引(ひ)っ込(こ)んでいた目(め)が戻(もど)りつつあります。

Since I've taken a leave of absence, my eyes that were sunken in due to lack of sleep from overtime work are gradually recovering. {to draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it}

警戒(けいかい)しつつ、私(わたし)は大通(おおどお)りから引(ひ)っ込(こ)んだところにある居酒屋(いざかや)へと歩(ほ)を進(すす)めた。

Being cautious, I moved towards the izakaya withdrawn from the main street. {to draw back, to sink, to cave in, to be set back (e.g. from a road), to withdraw (e.g. from the public eye), to retire to (somewhere), to stay indoors, to butt out, to stay out of it}