This is the 5729th most frequent Japanese word.
つかり
"つかり" refers to "soaking" or "immersion."
The word つかり (つかる in its base verb form) here refers to 'soaking in water', specifically a hot spring in this context.
温泉にゆっくりとつかりました。
I gently soaked in the hot spring.
The word つかり here metaphorically describes 'being absorbed' or 'immersed' in one's work or activity.
彼は作業に深くつかり、時間を忘れた。
He immersed himself deeply in the work and forgot the time.
In this context, つかり again refers to 'immersing' oneself, implying the relief of refreshing oneself after exertion.