co-occur
verb /ˌkəʊ əˈkɜː(r)/
  /ˌkəʊ əˈkɜːr/
[intransitive]Verb Forms
| present simple I / you / we / they co-occur |    /ˌkəʊ əˈkɜː(r)/   /ˌkəʊ əˈkɜːr/  | 
| he / she / it co-occurs |    /ˌkəʊ əˈkɜːz/   /ˌkəʊ əˈkɜːrz/  | 
| past simple co-occurred |    /ˌkəʊ əˈkɜːd/   /ˌkəʊ əˈkɜːrd/  | 
| past participle co-occurred |    /ˌkəʊ əˈkɜːd/   /ˌkəʊ əˈkɜːrd/  | 
| -ing form co-occurring |    /ˌkəʊ əˈkɜːrɪŋ/   /ˌkəʊ əˈkɜːrɪŋ/  | 
- to occur together or at the same time
- The words ‘heavy’ and ‘rain’ co-occur frequently.