Collins Chinese Dictionary Plus (3rd edition), 2011:
信
xìnI 动
1
(=相信) believe
- 轻(輕)信 qīngxìn readily believe
2
(=信奉) believe in
- 信教 xìnjiào be religious
- 信佛教 xìn Fójiào be a Buddhist
II 副
at will
- 信口开(開)河 xìn kǒu kāi hé shoot one's mouth off
III 名
1
(=书信) letter
- 信箱 xìnxiāng letterbox
- 寄信 jì xìn send a letter
2 (=信息) information
- 口信 kǒuxìn verbal message
3
(=信用) trust
- 失信 shīxìn lose trust
4
(=凭据) proof
- 信物 xìnwù evidence