Historical clue formulations

• Started listening, with "up" — 2019-04-17
• Snapped to attention, with "up" — 2018-06-05
• Livened (up) — 2012-09-29
• Sat (up) — 2011-11-23
• Became attentive, with "up" — 2011-01-11
• Brightened, with "up" — 2004-09-25
• Brightened, with "up" — 2000-01-27