It is a term that emerged under the protection of blockchain technology and the possibilities of decentralized finance - DeFi. We could translate it as "freeze." Users who stake their tokens through a smart contract can benefit from providing liquidity in different protocols and receive commissions, among other advantages. However, they are not recommended operations for users not completely familiar with the ecosystem.
Currently, you can simply stake your Ethix tokens on the EthicHub website created for this purpose (link) https://ethix.ethichub.com/es/stake or on Balancer or Uniswap.