This is the 16223rd most frequent Russian word.
расслабил
"Relaxed" or "loosened."
The word 'расслабил' here means 'relieved, loosened' as an action the subject actively takes upon their physical state.
Он расслабил напряжение в своих плечах после долгого рабочего дня.
He relieved the tension in his shoulders after a long workday.
In this sentence, 'расслабил' is used to describe the effect of the massage, emphasizing its outcome in making someone less tense.
Массаж расслабил его настолько, что он уснул.
The massage relaxed him so much that he fell asleep.
Here, 'расслабил' conveys the act of lessening one's focus or vigilance, illustrating a metaphorical relaxation.