colloquial form of '風邪をひく' — to catch a cold (get symptoms like runny nose, cough, fever).
夜遅くまで出かけていたら、風邪ひくよ。
If you stay out late, you'll catch a cold.
彼はここ数日で風邪ひいて、今日は会社を休んでいる。
He caught a cold in the past few days and is off work today.
寒いところに長くいると風邪ひきやすいから気をつけて。
Be careful — staying in the cold for a long time makes it easy to catch a cold.
帰省中に風邪ひかないように、手洗いうがいを忘れないで。
Don't forget to wash your hands and gargle so you don't catch a cold while visiting home.