係
xìhai HSK3

bind

系 (係) xì frequency
bind verb
to tie up or fasten with rope

他将马系在了树干上。

tā jiāng mǎ xì zài le shù​gàn shàng.

He tied the horse to the tree trunk.

relate verb
to connect or relate to

他始终心系祖国的发展。

tā shǐ​zhōng xīn xì zǔ​guó de fā​zhǎn.

He is always concerned about the development of his motherland.

be verb
to be (used in formal or literary contexts)

该项技术系我司自主研发。

gāi xiàng jì​shù xì wǒ​sī zì​zhǔ yán​fā.

This technology was independently developed by our company.

系 (係) hai
to be verb
Cantonese copula equivalent to 'to be' (is/am/are).

我系学生。

wǒ hai xué​sheng.

I am a student.

Frequency
Character
Written text
216th most common 985.9 per million
Movie subtitles
268th most common 626.2 per million appears in 91% of films
Word
Movie subtitles
30.1 per million appears in 11% of films
Written text
268.3 per million

Details
HSK 2.0
Level 5
HSK 3.0
Level 3
Simplified
系
Strokes
9
Unicode
U+4FC2

Sources
Definitions
CC-CEDICT
Frequency data
MTSU Chinese text computingSUBTLEX-CHBCC Corpus (BLCU)