Theruwan Saranai, Passambhayam!
You asked, “Anyway I just wanted to make a wish of learning more about this term passambhayam if someone could elaborate on it.”
Passambhayam means “calming down” or “cooling down.”
The verse in the Mahā Satipaṭṭhāna Sutta is, “Passambhayaṃ kāyasaṅkhāraṃ assasissāmī’ti sikkhati, ‘passambhayaṃ kāyasaṅkhāraṃ passasissāmī’ti sikkhati.”
That simply means, “One cools down one’s mind by cultivating good kāya saṅkhāra and stopping bad kāya saṅkhāra.”
kāya saṅkhāra are those saṅkhāra that control our bodily actions.
– So, bad kāya saṅkhāra lead to stealing, hitting, sexual misconduct, etc.
– Good kāya saṅkhāra lead to giving, physically helping others, etc.
That is a very simple explanation. I have not yet directly discussed that verse. But posts on that sutta at, “Mahā Satipaṭṭhāna Sutta.”
Sankhāra discussed at, “Sankhāra – What It Really Means.”
– As discussed there ALL three types of saṅkhāra (mano, vaci, and kāya) arise in one’s mind.
This section of the Mahā Satipaṭṭhāna Sutta is relevant to Anapanasati. It is Section 1.1 Kāyānupassanā ānāpāna pabba.
Many people, of course, incorrectly translate that verse has something to do with “breathing in and out.”
– There are several posts on Anapanasati at, “Bhāvanā (Meditation)” section.