テンション下がる

• Reading: テンションさがる
• Romaji: tenshon sagaru
• Kanji breakdown: 下がる (sagaru, to fall/drop) — テンション is katakana loanword.
• Pronunciation: /te.n.ɕo.n.sa.ɡa.ɾɯ/

Meaning

Losing energy or having one's mood drop — describes becoming deflated, disappointed, or less enthusiastic.

The opposite of テンション上がる, this phrase describes your energy and excitement levels falling. It covers everything from mild disappointment to having your mood completely killed. Universally understood and used in casual Japanese, it is the go-to expression for describing a drop in enthusiasm or spirits. Often shortened to テンション下がった (tenshon sagatta) in past tense.

Examples

1. 楽しみにしてたイベントが中止でテンション下がった。 The event I was looking forward to got canceled and my mood just dropped.
2. 朝から上司に怒られてテンション下がるわ。 Getting yelled at by my boss first thing in the morning really kills my mood.
3. 天気悪いとテンション下がるよね。 Bad weather just brings your mood down, right?

Usage Guide

Context: friends, casual conversation, social media, daily life

Tone: disappointed, deflated, low-energy

Do Say

• 雨でBBQ中止、テンション下がるわ〜。 (BBQ cancelled because of rain — my mood just dropped.)
• テンション下がることばっかり起きる月曜日。 (Mondays where nothing but mood-killing things happen.)

Don't Say

• 深刻な状況で「テンション下がる」は軽く聞こえる (Saying 'tenshon sagaru' about a genuinely serious or tragic situation sounds too casual and trivialising)

Common Mistakes

• Using テンション下がる for serious grief or clinical depression — it is meant for everyday disappointments and mood dips, not severe emotional states

Origin & History

Counterpart to テンション上がる, combining テンション (Japanese reinterpretation of 'tension' meaning energy level) with 下がる (sagaru, to fall/drop). Established alongside its positive counterpart in the 1990s-2000s.

Cultural Context

Era: 1990s-2000s mainstream adoption

Generation: All ages (universal casual expression)

Social background: Universal informal

Regional notes: Used across all of Japan. As common as its positive counterpart. A staple of everyday casual Japanese conversation.