сия́ть

verbimperfective (partner просия́ть)fairly common #2393C1

1.
to shine, to gleam, to glow
Со́лнце сия́ло весь день.
The sun shone all day.
Of the sun, stars, lights or polished surfaces.
2.
to beam, to be radiant
Она́ сия́ла от ра́дости.
She was beaming with joy.
Usually with от + genitive: сиять от радости.

Examples

Её лицо́ сия́ло от ра́дости.
Her face beamed with joy.
Злато сияло в лучах солнца.
The gold gleamed in the sunlight.
Его лицо́ сия́ло от сча́стья.
Her face was bright with happiness.
Обручавшийся вчера юноша сегодня сияет от счастья.
The young man who got engaged yesterday is beaming with happiness today.
На небе сияли мириады звёзд
Myriads of stars were shining in the sky.
Звезды́ сия́ют в не́бе.
Stars shine above in the sky.
Его глаза сия́ли.
His eyes were glowing.
Надаривший всем подарки дед сиял от счастья.
The grandfather who had given everyone presents was beaming with happiness.
Со́лнце сия́ло в не́бе уже высоко и ярко.
The shining sun was already high and bright in the sky.
В небе сияли мириады звёзд.
Myriads of stars shone in the sky.

Imperative
ты	сия́й
вы	сия́йте